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Table 2 Polysomnographic results on the entire night

From: Similar polysomnographic pattern in primary insomnia and major depression with objective insomnia: a sign of common pathophysiology?

 

Mean (SD) Normative (N = 30)

Mean (SD) Insomnia (N = 84)

Mean (SD) Depression (N = 95)

Median (P25-P75) Normative (N = 30)

Median (P25-P75) Insomnia (N = 84)

Median (P25-P75) Depression (N = 95)

P-value

SL (min)

17.81 ± 7.82

41.18 ± 37.04

45.57 ± 35.51

18.25 (10.33–24.5)

29.75 (18.42–54.42)

36.50 (23.33–59.00)

<0.001a,b

SE (%)

88.63 ± 3.85

71.63 ± 9.64

72.52 ± 11.43

89.11 (86.09–91.87)

73.49 (68.52–77.73)

75.50 (68.57–79.75)

<0.001a,b

SPT (min)

480.79 ± 55.48

432.37 ± 60.84

436.67 ± 67.14

482.17 (433.67–517.00)

429.75 (408.50–467.00)

439.33 (402.00–469.33)

0.001a,b

Duration of 1st, 2nd and 3rd third of the night (min)

160.26 ± 18.49

144.12 ± 20.28

145.56 ± 22.39

160.72 (144.56–172.33)

143.25 (136.17–155.67)

146.44 (134.00–156.44)

0.001a,b

TST (min)

447.57 ± 49.66

352.68 ± 62.13

362.59 ± 72.59

457.34 (409.33–479.00)

360.25 (322.42–393.42)

380.33 (335.00–408.33)

<0.001a;b

% stage 1

6.80 ± 2.99

6.98 ± 3.65

6.87 ± 3.83

5.82 (4.65–8.62)

7.20 (3.89–9.13)

6.38 (4.34–8.60)

0.923

% stage 2

55.78 ± 6.64

50.76 ± 8.67

51.50 ± 9.14

56.38 (51.47–61.16)

50.93 (45.61–56.00)

53.03 (47.53–57.55)

0.010a

% SWS

10.53 ± 6.16

6.92 ± 7.32

7.38 ± 6.85

9.46 (4.08–15.31)

4.64 (0.59–11.34)

5.74 (1.51–11.30)

0.009a,b

% REM

20.09 ± 3.21

16.96 ± 5.36

16.59 ± 5.36

19.89 (17.57–22.54)

17.15 (14.11–20.24)

17.14 (12.97–19.42)

<0.001a,b

% WASO

6.80 ± 3.37

18.38 ± 10.28

17.65 ± 11.18

6.24 (4.29–8.11)

15.98 (11.94–23.97)

15.99 (10.96–21.54)

<0.001a,b

REML

71.49 ± 24.16

85.75 ± 49.82

88.45 ± 57.47

72.5 (53.5–81.5)

69.00 (53.75–109)

70.67 (54.50–101.00)

0.764

Cycles

4.60 ± 0.97

3.83 ± 1.16

3.94 ± 1.20

4.5 (4.00–5.00)

4.00 (3.00–4.00)

4.00 (3.00–5.00)

0.004a,b

Number of awakenings

19.53 ± 5.16

36.25 ± 16.04

37.12 ± 21.46

19.00 (17.00–23.00)

29.00 (24.00–45.50)

29.00 (25.00–41.00)

<0.001a,b

       

Kruskal-Wallis Test

  1. SL sleep latency, SE sleep efficiency, SPT sleep period time, TST total sleep time, SWS slow-wave sleep, REM Rapid eye movement sleep, WASO wake after sleep onset, REML REM latency
  2. After Bonferroni correction: aNormative vs Insomnia p < 0.05, bNormative vs Depression p < 0.05, cInsomnia vs Depression p < 0.05